Pharmaceutical product.



UNITED STATES PATENT OFFICE.

'WILHELM HIEMENZ AND WALTER KROPP, F ELBEBFELD, .GERMANY,-.ASSIGNORS T0 ,FABIBENFAIBRIKEN VOIRIQIII FRIEDR. BAYER 8c 00., OF ELBERFELD, GERMANY, A

CORPORATION- OF GERMANY.

PHARMACEUTICAL PRODUCT.

No Drawing.

To all whom it racy concern:

Be it known that we, WILHELM HIEMENZ and WALTER KRoPr,-doctors of philosophy, chemists, citizens of the German Empire, residing at Elberfeld, Germany, have invented a new Pharmaceutical Product, of

' which the following is a specification.

Our invention concerns the production of the hitherto unknown 'isoborneol ester of the dibromo-dihydrocinnamic acid ,of the formula o,H, oHBr-oHBr ooo.c. 11

Speciflcaticn of Letters fatent.

Application filed September 21, 1911. Serial No. 650,525.

Patented May 21, 1912.

ture of 170 parts of bromin and 400 parts of carbon tetrachlorid is added to this solution which is stirred and well cooled. The liquid is distilled off and the residue is recrystallized from alcohol. The isoborneol ester of the dibromo-dil1ydrocinnamic acid is thus obtained inIthe shape of colorless and taste less brilliant crystals melting at 69 C.

VVe claim Theherein described isoborneol'ester of the dibromo-dihydrocinnamic acid, which crystallizes from alcohol in the shape of white brilliant crystals mcltingat 69 0.,

dif'ficultly soluble in water and being a valuable sedative, substantially as described.

In testimony whereof we'have hereunto set'our hands in the presence of two subscribing witnesses.

WILHELM HIEMENZ; [L.s.'] WALTER KROPP. [Ls] WVitnesses L. Norma, A. Norma. 

